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Earnings (loss) per share (Tables) | 12 Months Ended
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Dec. 31, 2017
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Schedule of Computation of the Income (Loss) and Share Data Used in the Basic and Diluted Earnings Per Share | The computation of the income (loss) and share data used in the basic and diluted earnings per share is as follows:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Basic earnings (loss) per share - |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 369,658 |  |  | $ | 325,928 |  |  | $ | (240,634 | )
Weighted-average shares outstanding |  |  | 42,111 |  |  |  | 42,036 |  |  |  | 43,716 |
Non-vested dividend participating awards |  |  | 308 |  |  |  | 322 |  |  |  | 145 |
|  |  | 42,419 |  |  |  | 42,358 |  |  |  | 43,861 |
|  |  | 8.71 |  |  |  | 7.69 |  |  |  | (5.49 | )
|  | 2017 |  |  | 2016 |  |  | 2015 |
Diluted earnings (loss) per share - |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 369,658 |  |  | $ | 325,928 |  |  | $ | (240,634 | )
Weighted-average shares outstanding used for basic earnings per share |  |  | 42,419 |  |  |  | 42,358 |  |  |  | 43,861 |
Share options on issue |  |  | — |  |  |  | 5 |  |  |  | 8 |
|  |  | 42,419 |  |  |  | 42,363 |  |  |  | 43,869 |
|  |  | 8.71 |  |  |  | 7.69 |  |  |  | (5.49 | )

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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